20 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



Favosites digitata, Rouringer. 



Favosites digitatus, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 38, pi. XV., 



fig. 4. 

 Pachypera cervicornis, Whi tea ves (pars). 1891. Con tr. to Can. Palaeon., vol. I., pt. 

 III., p. 206. 

 ii ii Whiteaves. 1892. Cont. to Can. Palaeon., vol. I., pt. IV., p. 273. 



Corallum consisting of cylindrical or slightly flattened, irregularly 

 branching stems varying in diameter from about 7 to 20 mm., or even 

 more, and apparently seldom attaining to any great size. The terminal 

 ends of the branches are sometimes slightly attenuated, at other times 

 they are thickened and end abruptly. Corallites prismatic, not very thin 

 walled. Calyces rather at right angles to the surface, somewhat unequal 

 in size measuring from slightly over 2-5 to 1 mm. in diameter in the same 

 individual ; they radiate outward toward the surface in the manner usual 

 in branching forms of this genus. Tabulae horizontal, complete, appar- 

 ently not numerous. Squamulre well developed and abundant on the 

 inner surfaces of the corallites. Pores of moderate size, in some speci- 

 mens rather distant and irregularly disposed, in others inclined to form 

 single rows. 



Favosites digitata occurs in the Hamilton formation of Ontario, in the 

 middle Devonian of Lakes Winnipegosis and Manitoba and the Devonian 

 of the Mackenzie River basin ; its nearest ally seems to be F. cervicornis, 

 Milne-Edwards and Haime, of the Corniferous formation in Canada, from 

 which it is distinguished by its much less robust and more straggling 

 form of growth, by having fewer pores that apparently do not occur in 

 regular rows, and by further slight differences in structure that are 

 noticeable when specimens of the two species are compared side by side. 



Devonian. — Thedford, Ont. ; Lake Manitoba, Pentamerus Point, Big 

 Sandy Point and east side of Narrows, J. B. Tyrrell, 1888 ; Lake 

 Winnipegosis, Dawson Bay, J. B. Tyrrell, 1889 ; Hay River, forty miles 

 above its mouth, R. G. McConnell, 1887 (one specimen), the "Ramparts' 7 

 Mackenzie River, R. G. McConnell, 1888 (three fragments), Vermilion 

 Falls, Peace River, R. G. McConnell, 1889 (one specimen). 



Genus Alveolites, Lamarck, 1801. 



(Syst. des An. sans Vert., p. 375.) 



Corallum in the form of hemispherical or discoidal masses or irregularly 

 shaped expansions of varying thickness, composed of more or less flattened, 

 intimately united, thin walled corallites opening most frequently obliquely 

 to the surface and connected by mural pores placed generally in the 



